Keywords: Alternate partials subtracted.svg en In the left of the figure harmonics of a square wave are alternately subtracted on the right all the partials are added; f x sin x + sgn x sin 3 x /3 + sin 5 x /5 + sgn x sin 7 x /7 + sin 9 x /9 + sgn x sin 11 x /11 own Pieter Kuiper 2010-05-02 Square waves |